39 lines
1.2 KiB
Python
39 lines
1.2 KiB
Python
def ptAdd(pt1,pt2):
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return [pt1[0]+pt2[0],pt1[1]+pt2[1]]
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def ptSub(pt1,pt2):
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return [pt1[0]-pt2[0],pt1[1]-pt2[1]]
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def antennae(arr):
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out = {}
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for i in range(0,len(arr)):
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for j in range(0,len(arr[i])):
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if arr[i][j] != ".":
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if arr[i][j] in out:
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out[arr[i][j]].append([i,j])
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else:
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out[arr[i][j]] = [[i,j]]
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return out
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def antinodes(antennae):
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out = []
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for a in antennae:
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for i in range(0,len(antennae[a])):
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for j in range(1,len(antennae[a])):
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pt1 = antennae[a][i]
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pt2 = antennae[a][j]
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an1 = ptAdd(pt1,ptSub(pt1,pt2))
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an2 = ptAdd(pt2,ptSub(pt2,pt1))
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if an2 not in out and an2[0] >= 0 and an2[1] >= 0 and an2[0] < 50 and an2[1] < 50:
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out.append(an2)
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if an1 not in out and an1[0] >= 0 and an1[1] >= 0 and an1[0] < 50 and an1[1] < 50:
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out.append(an1)
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return out
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arr = []
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with open("input08.txt") as file:
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for line in file:
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arr.append([])
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for a in line[:-1]:
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arr[-1].append(a)
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print(len(antinodes(antennae(arr)))) |